Millie's Marvellous Hat (Google eBook)
Millie loves hats, but she can't afford to buy any of the beautiful ones in the hat shop. But the shopkeeper has an idea. He produces a box containing an amazing hat with the most perfect shape and color imaginable - if Millie dares to imagine it. Millie does dare, and soon she sees not only her own marvellous hat, but everyone else's hats as well.